126531444643 has 2 divisors, whose sum is σ = 126531444644.
Its totient is φ = 126531444642.
The previous prime is 126531444539. The next prime is 126531444673. The reversal of 126531444643 is 346444135621.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-126531444643 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 126531444643.
It is not a weakly prime, because it can be changed into another prime (126531444673) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63265722321 + 63265722322.
It is an arithmetic number, because the mean of its divisors is an integer number (63265722322).
Almost surely, 2126531444643 is an apocalyptic number.
126531444643 is a deficient number, since it is larger than the sum of its proper divisors (1).
126531444643 is an equidigital number, since it uses as much as digits as its factorization.
126531444643 is an evil number, because the sum of its binary digits is even.
The product of its digits is 829440, while the sum is 43.
The spelling of 126531444643 in words is "one hundred twenty-six billion, five hundred thirty-one million, four hundred forty-four thousand, six hundred forty-three".